Festive & Tax Update Sharing Platform

I'm in need of a professionally designed website and a mobile app (for both iOS and Android) that will serve as a platform for users to access, download, and share festive and tax-related banners.

Key Features:
- Backend for uploading banners concerning various festivals (e.g., Navratri, Holi) and tax updates (e.g., Income Tax, GST)
- User dashboard where they can see all the uploaded banners
- Download option for selected banners with personalized details (Name, Business Name, Phone No., Email ID) at the bottom
- Direct sharing option to social media platforms
- Subscription-based model (monthly/yearly), with non-subscribers having access to watermarked banners

User Authentication:
- Mobile-based authentication process

Design Style:
- The design of both the website and the app should be professional and corporate.

Ideal skills and experience for the job would include:
- Extensive knowledge in web development and mobile app development
- Experience in creating user-friendly, professional, and corporate design styles
- Proficiency in implementing secure mobile user authentication systems
- Understanding of subscription-based models within apps and websites
- Ability to integrate social media sharing options within mobile apps